> He doesn't seem aware that, by far, the main reason for using power-of-two hash table sizes is so you can use a simple bitshift to eliminate modulo entirely.

> He doesn't seem aware that, by far, the main reason for using power-of-two hash table sizes is so you can use a simple bitshift to eliminate modulo entirely. [...] using a power of two to size the table so that a hash can be mapped to a slot just by looking at the lower bits. He seems to know this bit :)